Auto alarm



FIG. 1 is a front perspective view of an auto alarm showing my new design with the broken lines shown for illustrative purposes only and forming no part of the claimed design;

FIG. 2 is an enlarged bottom plan view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a rear elevational view of FIG. 5. 

The ornamental design for auto alarm, as shown and described. 